Automated Tractor at work

U Tube video which I do not know how to embed.

Automated tractors are being deployed today, inhibited only by government regulations. Notice that there re no steel tracks, no embedded magnetics; just a smart vehicle able to till the land.

And this link has a video of the Volcano park automated bus tour.
A start up producing automated control for driverless vehicles, and another vendor of automated guidance.

University of Illinois has these RoboTractors operating for two years:

"One test tractor has operated without a human driver for two planting seasons, driving itself from garage to field, planting several acres of crops, and returning to the garage. The self-guidance system uses a gyroscope, Global Positioning System, video camera and computer. Tractors using the technology can go faster, operate at night and in fog and, because they are accurate within inches, increase yields by planting more rows."